The light of any combustible consumed on the "incandescent"
system is derived from glowing particles of ceria, thoria, or similar
metallic oxides; and the character or shade of the light they emit is a
function, apart from the temperature to which they are raised, of their
specific chemical nature. Still, the light of incandescent acetylene is
sufficiently pleasant, and according to Caro is purer white than that of
incandescent coal-gas; but lengthy tests carried out by one of the
authors actually show it to be appreciably inferior to luminous acetylene
for colour-matching, in which the latter is known almost to equal full
daylight, and to excel every form of artificial light except that of the
electric arc specially corrected by means of glass tinted with copper
salts.
CONDITIONS FOR INCANDESCENT ACETYLENE LIGHTING.--For success in the
combustion of acetylene on the incandescent system, however, several
points have to be observed. First, the gas must be delivered at a
strictly constant pressure to the burner, and at one which exceeds a
certain limit, ranging with different types and different sizes of burner
from 2 to 4 or 5 inches of water. (The authors examined, as long ago as
1903, an incandescent burner of German construction claimed to work at a
pressure of 1.
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